A fail-safe release mechanism for use with patient positioning support apparati having a base structure and a patient support structure, to prevent collapse of the patient support during disconnection of the patient support structure from the base structure.

A fail-safe release mechanism for use with patient positioning support apparati having a base structure and a patient support structure, to prevent collapse of the patient support during disconnection of the patient support structure from the base structure.

A locking mechanism for releasably locking a lock bolt against axial movement includes: a locking mechanism for releasably locking a lock bolt against axial movement, and: an elongate member 1 axially moveable relative to a housing and, in use, in moveable engagement with a lock bolt. The mechanism also includes a flap assembly 2 moveable between a first, closed position, located between the elongate member and the housing so as to prevent axial movement of the elongate member towards the housing, and a second, open position allowing the elongate member to move axially towards the housing.

A locking mechanism for releasably locking a lock bolt against axial movement includes: a locking mechanism for releasably locking a lock bolt against axial movement, and: an elongate member 1 axially moveable relative to a housing and, in use, in moveable engagement with a lock bolt. The mechanism also includes a flap assembly 2 moveable between a first, closed position, located between the elongate member and the housing so as to prevent axial movement of the elongate member towards the housing, and a second, open position allowing the elongate member to move axially towards the housing.

A fail-safe release mechanism for use with patient positioning support apparati having a base structure and a patient support structure, to prevent collapse of the patient support during disconnection of the patient support structure from the base structure.

A fail-safe release mechanism for use with patient positioning support apparati having a base structure and a patient support structure, to prevent collapse of the patient support during disconnection of the patient support structure from the base structure.

A fail-safe release mechanism for use with patient positioning support apparati having a base structure and a patient support structure, to prevent collapse of the patient support during disconnection of the patient support structure from the base structure.

A fail-safe release mechanism for use with patient positioning support apparati having a base structure and a patient support structure, to prevent collapse of the patient support during disconnection of the patient support structure from the base structure.

The subject matter of this specification can be embodied in, among other things, a track lock assembly that includes a pawl assembly comprising a pawl arm extending from a pawl axis and configured to engage a slot in a slider assembly, a cam arm extending from the pawl axis and having a pawl cam, and a compliant member, and a position lock assembly comprising a first lock arm extending from a lock axis and an actuator configured to urge rotation of the first lock arm between a lock locked position and a lock unlocked position, the first lock arm configured to engage and retain the cam arm in a pawl locked position when the first lock arm is in the lock locked position and disengage the cam arm in the lock unlocked position such that the compliant member is able to urge the pawl assembly to a pawl unlocked position.

The subject matter of this specification can be embodied in, among other things, a track lock assembly that includes a pawl assembly comprising a pawl arm extending from a pawl axis and configured to engage a slot in a slider assembly, a cam arm extending from the pawl axis and having a pawl cam, and a compliant member, and a position lock assembly comprising a first lock arm extending from a lock axis and an actuator configured to urge rotation of the first lock arm between a lock locked position and a lock unlocked position, the first lock arm configured to engage and retain the cam arm in a pawl locked position when the first lock arm is in the lock locked position and disengage the cam arm in the lock unlocked position such that the compliant member is able to urge the pawl assembly to a pawl unlocked position.